A necessary comment: It is important to note that, in despite of the direct connection between the holographic qubit threads model and the kinematic space, there is actually one significant difference between the two: In fact, CMI threads that one-to-one map to points in the kinematic space do not need to meet the strict mathematical requirements (especially the density bound) of the bit threads; instead, these CMI threads only need to meet the constraints on the thread bundle fluxes (see [1]} for a discussion of this issue). On the other hand, qubit threads that satisfy the non-trivial bulk density bound constraint of bit threads have the potential to extract more information in physics, although the technical difficulties will increase mathematically. For example, we can further consider the connection between the more general non-locking bit thread configurations and the more general bulk surfaces. Furthermore, various updated versions of bit threads have been very useful tools for studying various aspects of the relationship between geometry and quantum entanglement, it is possible to further consider how the thread/state rules adapt to the covariant bit threads [2]} of the covariant RT formula [3]}, the quantum bit threads [4]}, [5]} that can account for the bulk quantum corrections to the RT formula [6]}, [7]}, the Lorentzian bit threads [8]}, [9]} that can characterize the holographic complexity [10]}, [11]}, the hyperthreads [12]}, [13]} that can study the multipartite entanglement, and so on, and may provide useful insights on all of these topics.
